976 



THE BELL SYSTEM TECHNICAL JOURNAL, OCTOBER 1951 



Figures 7 and 8 show measurements for the longitudinal mode. Variations 

 of about 0.6 per cent in the velocity are obtained, and the saturated elastic 

 constants, Q and decrement are 



c'n + cU + 2cU = 6.55 X lO^^, Q = 390, 5 = 0.008 (7) 



^>° 



1.2 



1.0 



0.8 



0.6 



0.2 



•02 



•04 



1000 2000 3000 4000 5000 6000 

 MAGNETIC FIELD STRENGTHEN, IN OERSTEDS 



Fig. 5— Change in velocity in percent from demagnetized values as a function of the 

 magnetizing field for a shear wave in a (110) section when the particle velocity is along 

 the [001] direction and the field along the [001] direction. 



Combining the elastic constants, the saturated elastic constants are evalu- 

 ated: 



c'n = 2.53, c'i2 = 1.58, cU = 1.22, (8) 



all in 10" dynes/cm*. 



